October 11th is a day were whoever calls dibs gets to control the person who doesn't has to do whatever the other says without question
John: "Jesus Christ, jimmy got me"
Julian: "what do you mean man?"
John: "didn't you know? Today's October 11th and Jimmy called dibs before I did. Now I gotta eat food off the floor all day!"
Julian: "wait?! It's october 11th?! I totally forgot man! I need to go call dibs on Jessica!"